<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            background: url(./images/desktop_1.jpg) no-repeat top center/cover;
        }
    </style>
</head>
<body>
    <script>
        function getRandom(N,M){
            return Math.floor(Math.random()*(M-N+1))+N
        }
        // console.log(document.body);
        const random = getRandom(1,10)
        document.body.style.background = `url(./images/desktop_${random}.jpg)`
    </script>
</body>
</html>